Check if element exists or not

I have a code that grabs a price tag from this HTML section

<div class="main">
    <div class="cost-box">
        <ins><span>$</span><price>10.00</price></ins>
    </div>
</div>

Here’s the code I use to get the 10.00 price:

import requests
from bs4 import BeautifulSoup as bs

url = "https://www.sample.com/sample/123abcd"

response = requests.get(url).text
soup = bs(response, "html.parser")

container = soup.find("div", class_="cost-box")
price = container.price    # <-- get <price> tag from container
print(price.text)

The only problem though is that some pages doesn’t have prices on them and would only have something like this in their HTML:

<div class="cost-box">
   
</div>

And my code would now give an error saying

price = container.price.text
AttributeError: 'NoneType' object has no attribute 'text'

Is there a way to add some sort of a checkpoint on whether the price variable exists? Instead of having the error and the whole program coming to a stop, I just want the price to say invalid and the code would still continue (I placed it on a for loop).

>Solution :

You can use if-else:

import requests
from bs4 import BeautifulSoup as bs

# price missing:
html_text = """
<div class="main">
    <div class="cost-box">

    </div>
</div>"""

soup = bs(html_text, "html.parser")

container = soup.find("div", class_="cost-box")
price = container.price.text if container.price else "Invalid"
print(price)

Prints:

Invalid